Source : Webster's Revised Unabridged Dictionary (1913)

Enrichment \En*rich"ment\, n.
   The act of making rich, or that which enriches; increase of
   value by improvements, embellishment, etc.; decoration;
   embellishment.

Source : WordNet®

enrichment
     n 1: act of making fuller or more meaningful or rewarding
     2: a gift that significantly increases the recipient's wealth